8: Multi-sample integration task for mouse brain data¶

HiSTaR can process Correct the batch effect. In this tutorial, we use Mouse Brain dataset to introduce the analysis.
mouse brain data comes from STGMVA https://zenodo.org/records/8141084
The complete experimental dataset is available here https://zenodo.org/records/15599070

Loading package¶

In [1]:
import scanpy as sc
import torch
import anndata as ad
import matplotlib.pyplot as plt
import warnings
warnings.filterwarnings('ignore')
torch.set_default_dtype(torch.float64)
In [2]:
import HiSTaR
random_seed = 2023
HiSTaR.fix_seed(random_seed)
In [3]:
import matplotlib as mpl
mpl.rcParams.update({
    'font.family': 'Arial',              
    'axes.labelweight': 'bold',          
    'axes.titleweight': 'bold',          
    'axes.titlesize': 12,                
    'axes.titlelocation': 'left',        
    'figure.constrained_layout.use': True,  
    'figure.dpi': 300,                  
    'savefig.dpi': 300,
})

mclust_palette = [
    "#F3766E", "#5BB300", "#2E96FF", "#C655D9",
    "#FFB549", "#00C6EA", "#9B8500", "#009E73"
]

Reading ST data and showing two sections of mouse brain data¶

In [4]:
device = 'cuda:0' if torch.cuda.is_available() else 'cpu'

file_fold = '../data/Adult_Mouse_Brain/Section1'
adata1 = sc.read_visium(file_fold, count_file='V1_Adult_Mouse_Brain_Coronal_Section_1_filtered_feature_bc_matrix.h5', load_images=True)
adata1.var_names_make_unique()

file_fold = '../data/Adult_Mouse_Brain/Section2'
adata2 = sc.read_visium(file_fold, count_file='V1_Adult_Mouse_Brain_Coronal_Section_2_filtered_feature_bc_matrix.h5', load_images=True)
adata2.var_names_make_unique()

adata = ad.concat([adata1,adata2],label="data")
adata.obs['data'].replace({'0':'Section 1', '1':'Section 2'}, inplace=True)
In [5]:
adata
Out[5]:
AnnData object with n_obs × n_vars = 5710 × 32285
    obs: 'in_tissue', 'array_row', 'array_col', 'data'
    obsm: 'spatial'
In [6]:
plt.rcParams['figure.facecolor'] = 'white'
plt.rcParams['axes.facecolor'] = 'white'
plt.rcParams["figure.figsize"] = (6, 5)
sc.pl.embedding(adata, basis='spatial',size=35, color='data',show=False) 
# plt.savefig(
#     'MB_Batch.png',
#     dpi=300,
#     bbox_inches='tight',
#     facecolor='white',  
#     edgecolor='white'   
# )
Out[6]:
<Axes: title={'left': 'data'}, xlabel='spatial1', ylabel='spatial2'>
No description has been provided for this image
In [7]:
adata.layers['count'] = adata.X.toarray()
sc.pp.filter_genes(adata, min_cells=50)
sc.pp.filter_genes(adata, min_counts=10)
sc.pp.normalize_total(adata, target_sum=1e6)
sc.pp.highly_variable_genes(adata, flavor="seurat_v3", layer='count', n_top_genes=2000)
adata = adata[:, adata.var['highly_variable'] == True]
sc.pp.scale(adata)

from sklearn.decomposition import PCA
adata_X = PCA(n_components=200, random_state=42).fit_transform(adata.X)
adata.obsm['X_pca'] = adata_X
In [8]:
graph_dict = HiSTaR.graph_construction(adata, 12)

Training the model¶

STGMVA aims to learn the representations by two-step process. First, pretrained the GMM clustering model. Second, discerned the spatial domains for spatial transcriptomics data.

After model training, the learned representations will be saved in adata.obsm['embedding'], and can be used for spatial clustering.

In [9]:
histar_net = HiSTaR.histar(adata.obsm['X_pca'], graph_dict, device=device)
histar_net.train()
histar_feat, _, _, _ = histar_net.process()
adata.obsm['HiSTaR'] = histar_feat
In [10]:
adata
Out[10]:
AnnData object with n_obs × n_vars = 5710 × 2000
    obs: 'in_tissue', 'array_row', 'array_col', 'data'
    var: 'n_cells', 'n_counts', 'highly_variable', 'highly_variable_rank', 'means', 'variances', 'variances_norm', 'mean', 'std'
    uns: 'data_colors', 'hvg'
    obsm: 'spatial', 'X_pca', 'HiSTaR'
    layers: 'count'
In [11]:
#HiSTaR.configure_r_environment()   # If you encounter problems loading R packages, you can manually configure your path in this function.
In [12]:
HiSTaR.mclust_R(adata, n_clusters=8, use_rep='HiSTaR', key_added='HiSTaR')

R[write to console]:                    __           __ 
   ____ ___  _____/ /_  _______/ /_
  / __ `__ \/ ___/ / / / / ___/ __/
 / / / / / / /__/ / /_/ (__  ) /_  
/_/ /_/ /_/\___/_/\__,_/____/\__/   version 6.1.1
Type 'citation("mclust")' for citing this R package in publications.


fitting ...
  |======================================================================| 100%
Out[12]:
AnnData object with n_obs × n_vars = 5710 × 2000
    obs: 'in_tissue', 'array_row', 'array_col', 'data', 'HiSTaR'
    var: 'n_cells', 'n_counts', 'highly_variable', 'highly_variable_rank', 'means', 'variances', 'variances_norm', 'mean', 'std'
    uns: 'data_colors', 'hvg'
    obsm: 'spatial', 'X_pca', 'HiSTaR'
    layers: 'count'

Visualization¶

Batch effect removal figure¶

In [13]:
plt.rcParams['figure.facecolor'] = 'white'
plt.rcParams['axes.facecolor'] = 'white'
fig, ax_list = plt.subplots(1, 3, figsize=(14, 4), facecolor='white')
sc.pp.neighbors(adata, use_rep='X_pca', metric='cosine')
sc.tl.umap(adata)

sc.pl.umap(
    adata,
    color='data',
    title='Uncorrected data',
    ax=ax_list[0],
    show=False,
    s=16,
    frameon=False
)

sc.pp.neighbors(adata, use_rep='HiSTaR', n_neighbors=10)
sc.tl.umap(adata)
sc.pl.umap(
    adata,
    color='data',
    ax=ax_list[1],
    title='Batch corrected',
    show=False,
    s=16,
    frameon=False
)

sc.pl.umap(
    adata,
    color='HiSTaR',
    ax=ax_list[2],
    title='Spatial clustering',
    show=False,
    s=16,
    frameon=False
)

for ax in ax_list:
    ax.set_facecolor('white')

plt.tight_layout(w_pad=0.02)
# plt.savefig(
#     'MB_Batch_umap.png',
#     dpi=300,
#     bbox_inches='tight',
#     facecolor='white',  
#     edgecolor='white'  
# )
No description has been provided for this image

Spatial clustering for two sections¶

In [14]:
import seaborn as sns
adata_section1 = adata[adata.obs['data']=='Section 1', :]
adata_section2 = adata[adata.obs['data']=='Section 2', :]
rgb_values = sns.color_palette("husl", len(adata.obs['HiSTaR'].unique()))
color_fine = dict(zip(list(adata.obs['HiSTaR'].unique()), rgb_values))
fig, ax_list = plt.subplots(1, 2, figsize=(9, 4))
sc.pl.embedding(adata_section1,
            basis='spatial',
            color='HiSTaR',
            show = False,
            s=70,
            title='Section 1',
            palette=color_fine,
            ax = ax_list[0])

sc.pl.embedding(adata_section2,
            basis='spatial',
            color='HiSTaR',
            show = False,
            s=70,
            title = ['Section 2'],
            palette=color_fine,
            ax = ax_list[1])

plt.tight_layout(w_pad=0.3)
# plt.savefig('MB_Batch_spatial.png',dpi=300, bbox_inches='tight',facecolor='white')
No description has been provided for this image